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DS24B33+ Datasheet(PDF) 7 Page - Maxim Integrated Products |
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DS24B33+ Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 22 page 4Kb 1-Wire EEPROM with 200k Write/Erase Cycles _______________________________________________________________________________________ 7 1ST STAGE 2ND STAGE 3RD STAGE 4TH STAGE 7TH STAGE 8TH STAGE 6TH STAGE 5TH STAGE X0 X1 X2 X3 X4 POLYNOMIAL = X8 + X5 + X4 + 1 INPUT DATA X5 X6 X7 X8 Figure 4. 1-Wire CRC Generator 32-BYTE INTERMEDIATE STORAGE SCRATCHPAD ADDRESS 0000h to 001Fh 32-BYTE FINAL STORAGE EEPROM PAGE 0 0020h to 003Fh 32-BYTE FINAL STORAGE EEPROM PAGE 1 0040h to 01DFh FINAL STORAGE EEPROM PAGES 2 to 14 01E0h to 01FFh 32-BYTE FINAL STORAGE EPPROM PAGE 15 Figure 5. Memory Map The shift register bits are initialized to 0. Then, starting with the LSB of the family code, one bit at a time is shifted in. After the 8th bit of the family code has been entered, the serial number is entered. After the last bit of the serial number has been entered, the shift register contains the CRC value. Shifting in the 8 bits of the CRC returns the shift register to all 0s. Memory The DS24B33 EEPROM array (Figure 5) consists of 16 pages of 32 bytes each, starting at address 0000h and ending at address 01FFh. In addition to the EEPROM, the device has a 32-byte volatile scratchpad. Writes to the EEPROM array are a two-step process. First, data is written to the scratchpad and then copied into the main array. The user can verify the data in the scratch- pad prior to copying. |
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